Why does my mom’s rule regarding sleepovers with my boyfriend make any sense?

My mom knows I’ve had sex. She’s aware that my boyfriend & I are sexually active. However, she won’t allow me to have a sleepover with my boyfriend until I am at least 18. Why is this? If we’re literally active why can’t we have a sleepover? We’ve been together for a year & 3 months as it is and he’s 18 years old. I’m 17. I’m just confused as to how this would make any sense?
Why does my mom’s rule regarding sleepovers with my boyfriend make any sense?
Post Opinion